Kagamine Rin is a Vocaloid developed by Crypton Future Media as part of the Character Vocal series, like fellow Vocaloids Hatsune Miku and Megurine Luka. According to Wataru Sasaki (Wat), she shares a soul with her male counterpart, Kagamine Len, and both of their voices are provided by Japanese voice actress, singer, and stage actress Asami Shimoda. Their first design was created by KEI.

Some of Rin’s songs include “The Lost One’s Weeping,” “Meltdown,” “I Like You, I Love You,” “Tokyo Teddy Bear,” “Undead Enemy,” Abstract Nonsense,” as well as cover songs and a number of duets with Len such as “World Domination How-to,” “Sincerity Nature: Drastic Measures of Ignorance,” “The Straight-Faced Science Girl,” “Electric Angel,” and “Seasonal Feathers.”